roll Picard back to 1.126
roll Picard back to 1.126

1.130 introduced a bug in CollectGcBiasMetrics

https://github.com/broadinstitute/picard/issues/212

where the BAM file must have a read group id assigned, or else
the CollectGcBiasMetrics tool fails to run.

1.126 still works without read group id.

slowkow/picardmetrics